I just grabbed http://www.vagabondchargers.com/#!pr...rger-micro-usb with coupon HOLIDAY it's 50% off and while it's not a big capacity battery at all I think the format is sheer win. I had a flash drive before with me anyways. I hope it's not much heavier. I often just need one more hour with Google Maps to get home and this will do just that. I still have a huge Romoss for other scenarios.